IMO, Haley = good 4th liner, on a good team. what's missing, in our armchair GM assessments, is evidence of his character (or, lack of).
did he party too much? did he only care about revenge? was he a team palyer? did he mess with Snow's wife/girlfriend/blonde-kissing-another-blonde-at-a-party's friend?
unfortunately, most of us will never know the 'story behind the story'. we just have to wait, and see how things turn out.